<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <input type="button" value="求点赞" id="btn" onclick="change()"/>
    <script>
        function change(){
        var btn=document.getElementById("btn");
        btn.value="谢谢";
        }
    </script>
</body>
</html>
